Finding the Third Proportional to 20,218.50 and 42,531

Step by Step Solution

1. Step 1: Write the proportion equation
   20,218.50 : 42,531 = 42,531 : x
2. Step 2: Convert to fraction form
   20,218.50/42,531 = 42,531/x
3. Step 3: Cross multiply
   20,218.50x = 42,531 × 42,531
4. Step 4: Simplify right side
   20,218.50x = 1,808,885,961
5. Step 5: Solve for x
   x = 1,808,885,961/20,218.50
6. Step 6: Final answer
   x = 89,466.87